Hi Jerry, I have a good number of MeanWell S-240-48 which have a trimpot to set the max voltage and some people have designed small screw-on boards to add current limit to these supplies to use them as simple I-U chargers at 48V 5A each so a pair of them can charge a 4kWh pack overnight within 8 hours if it is completely drained. https://www.mouser.com/ProductDetail/Mean-Well/S-240-48/
For my current truck, I will take 48V server supplies and modify those to become a charger, the main reason to do that is because I can get those 3kW supplies for $20. 2 of them can max out a public charging station, 6kW from a J1772. For vehicle to house from a 48V pack, I would look at used UPS (Uninterruptible Power Supply) with bad batteries and find one that takes 48V of batteries. These are not the small supplies, you likely will end up buying a 3 or 5kVA UPS to get this battery voltage. I even found a cheap 3kVA UPS that takes 120VDC batteries, perfect for my previous truck. I just had to remove the wire from the external battery pack enclosure and wire it via a DC breaker into the truck as backup battery, so I could plug the UPS into the truck and get 110VAC Cor. -----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of jerry freedomev via EV Sent: Tuesday, January 30, 2018 3:45 PM To: Electric Vehicle Discussion List Cc: jerry freedomev; fred Subject: Re: [EVDL] Leaf module charging recommendations Hi Fred and All, I measured them with a known good meter at 3.53v/cell so use that to calibrate yours. I don't charge them up so safer to ship.I parallel the 2 48vdc nom sections in a 4 kwh module and charge them with a MPJA sold hf240w-sf-48. Once you get it, adjust it to 49.2vdc and you are good. Don't charge over 49.2vdc. I too am looking for more powerful and reasonably priced solutions that can handle lithium in 48, 96, 120 and 144vdc packs.I think your 3vdc/cell is too low and I'm using 3.2vdc/cell for now.Would like to hear others on what voltages the 2013 Volt uses or what they are using.?And what inverters at a reasonable price one can use to run off the 48vdc EV pack to give V2H?Thanks, Jerry Dycus From: fred via EV <ev@lists.evdl.org> To: via EV <ev@lists.evdl.org> Cc: fred <fred_do...@yahoo.com> Sent: Tuesday, January 30, 2018 6:15 PM Subject: [EVDL] Leaf module charging recommendations Thanks to Jerry Dycus for selling me a great looking clean Volt battery module. My still-working Radio Shack (top of the line) digital multimeter tells me all the cells are within 0.01 at 3.56 or 3.57 volts. I've found this useful bit of data: Number of cells 36 Construction 12 in-series x 3 in parallel Length 9.5" Width 9.5" Height 10.5 Weight 45 lbs Output terminal M6 nut Amp Hour 47 Total Voltage 48vdc CELL SPECIFICATIONS Cell type Laminate type Cathode material LiMn2O4 with LiNiO2 Anode material Graphite Rated capacity (0.3C) 17 Ah Average voltage 3.8 VDC Maximum Voltage 4.2VDC Minimum Voltage 3.0VDC I measured 42.5vdc across each 12 cell block and the math says it should be 42.72vdc, which is close enough for my meter. It's not 48vdc and from an earlier discussion I expected that to be the case. When it comes to charging this battery, I would like to ensure to get the right stuff. My experience with other lithium based batteries is that the nominal voltage of the charger is referenced to the battery and in all cases, the battery voltage is higher than the nominal voltage "listed." That is to say, a 36v battery charges to 42vdc and rarely drops to the 36v reference figure in regular use. The charger, of course, pushes electrons into the battery at those higher levels. In the case of the Volt battery, I believe I would not want to use an off-the-shelf charger rated for a 48v battery. My search results have all been ending in devices with excessive top-end termination. I would like to have an off-the-shelf solution, however, if such a charger exists. My current collection of chargers are plug-in and go type, in that they have appropriate profiles for charging to a specific level and tapering off as appropriate for the pack. As an additional consideration, this battery does not need to be charged in an hour or even two or three. I'm amenable to a configuration that requires a ten hour or longer charge period, especially if cost is lower. I welcome corrections to my train of thought, even to the point of derailment as appropriate. I'm hoping for an off-the-shelf solution that works out-of-the-box or works with appropriate adjustments on the panel or equivalent. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20180130/c42b1a2d/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) -------------- next part -------------- An HTML attachment was scrubbed... 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